Microsoft Build is underway sharing many useful features. The Azure Cosmos DB API is a versatile tool with a number of options. There are some quickstart tutorials and samples for these.
multi-master write support. Multi-master in Azure Cosmos DB provides single-digit millisecond latency to write data and availability with built-in flexible conflict resolution support. There are some good examples in the article to help understand this functionality better.
Azure Operational Data Services includes Azure SQL DB; PostgreSQL; MySQL; Redis Cache; and Cosmos DB.